Starrett 54110 O1 Tool Steel Flat Stock 5/16x3.5x18 in

Product Description

The STARRETT 54110 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. It is made from AISI Type O1 tool steel, a versatile oil-hardening grade known for its good dimensional stability during heat treatment and its ability to hold a keen edge after hardening. This bar measures 5/16 inches thick, 3-1/2 inches wide, and 18 inches long, and weighs approximately 5.58 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making this stock suitable for applications where dimensional precision before heat treatment matters. Machinists, tool and die makers, and metalworking shops stock this material for fabricating punches, dies, gauges, and custom tooling.

This flat stock is used in machine shops, tool rooms, and fabrication operations that require a reliable general-purpose tool steel in the annealed condition. It is supplied soft and ready to machine, then oil-quenched to harden after final shaping. Typical applications include blanks for punches, dies, cutting tools, arbors, and fixtures where moderate toughness and wear resistance are required. The 18-inch length and 3-1/2-inch width provide a practical starting blank size for a wide range of tooling projects.

Key Features

• AISI Type O1 oil-hardening tool steel in the annealed, machinable condition
• Thickness of 5/16 inches with plus or minus 0.001 inches thickness tolerance
• Width of 3-1/2 inches with a width tolerance of 0.000 to minus 0.005 inches
• Length of 18 inches with a length tolerance of plus 0.250 inches
• Squareness held to 0.003 inches per inch on all edges
• Weighs 5.58 pounds per bar

Compatibility

Designed as a general-purpose O1 oil-hardening tool steel flat stock suitable for toolmaking, die making, and precision machining applications requiring annealed stock that can be machined and then oil-quenched to final hardness.

Installation Notes

Machining and heat treatment of tool steel should be performed by qualified machinists or tool and die makers familiar with O1 grade steel. Always anneal or stress-relieve the stock as needed before rough machining, and follow the steel manufacturer's recommended heat treatment parameters for hardening and tempering. Cutting operations should use appropriate speeds and feeds for tool steel. Wear appropriate PPE when handling, cutting, or heat-treating steel stock.